Shirt color and protection from UV
Light colored clothing will provide better protection from UV light.
Ultraviolet (UV) radiation is part of the electromagnetic spectrum of light that travels to earth from the sun. In the spectrum, it falls between visible light and X-rays. UV light falls at the blue end of the light spectrum and cannot be seen by the naked eye. It contains a higher energy level and shorter wavelength compared to visible light. Based on its effect on living organisms, UV light is classified in three categories - namely UVA, UVB and UVC.
UV levels are normally at their highest around 10:00 am to 2:00 pm everyday. One of the most convenient ways of measuring UV levels is the UV index. Each unit of the UV index represents about 25mW per square meter of UV radiation. The UV index is a very useful way of providing information to the public regarding daily UV exposure levels
The UV index range is described as follows:
Less than 3: Moderate levels
Between 3 and 6: High levels - enough to cause sunburn even at temperatures below 27 degrees Celsius
Between 7 and 9: Very high levels - enough to cause sunburn on cloudy days
More than 9: Extreme levels - that cause sunburn to an unprotected skin within 12 minutes.
Avoid long exposure to strong sunlight. Wear protective clothing and eyewear.